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RE: Locking people out from messenger
It sounds like a description of account lockout, although I don't know whether Messenger / Passport use it.
The way that works is that after a certain number of incorrect login attempts, the account is locked out for some time -- let's say one minute. During the lockout period, even logon attempts with the correct password will fail. That helps slow down brute force / dictionary password attacks, to where they become impractical.
If this scheme is used, your friend would simply have to try to log on with your Passport email address and any incorrect password enough times to trigger the lockout, to leave you unable to log back on for the lockout period, too.
I seem to remember running into some lockout issues with Passport many years ago, but don't remember the details anymore.
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